I'll be regularly writing updates on the current sea ice extent (SIE) as reported by IJIS (a joint effort of the International Arctic Research Center and the Japan Aerospace Exploration Agency) and compare it to the sea ice extents in the period 2006-2009. The JAXA graph is favoured by almost everyone, probably because it looks so nice compared to other graphs (like the one by Arctic ROOS, the University of Bremen and the Danish Meteorological Institute). All the years have a nice colour of their own which makes it easy to eyeball the differences between trends. Most of the betting on minimum SIE is based on the IJIS data. NSIDC has a nice explanation of what sea ice extent is in their FAQ.
June 27th 2010
I'm writing this update now, before today's revision of yesterday's reported melt, because I'll be gone for the day.
The provisional number is 105,468 square km, another century break after the 103,594 square km on the 25th. Until recently this number would have been adjusted downwards by at least 15-30K, but it appears to be that time of the year (after the switching of some parameters to account for melt ponds etc) when revisions get smaller and some time soon might even go the other way. Yesterday for instance we saw a revision of just 3K.
Edit: Another small revision has made yesterday's reported melt the 4th century break of this month (2007 had 5): 100,937 square km.
So 2010 had a reported century break yesterday and today also. The day before the first century break there was a reported number of 85K. Nevertheless, 2006 had the highest reported melt on the first two dates (since the last update) because of two century breaks, and 2007 had its first century break of the coming spectacular series yesterday. But 2010 came in second on all three dates and even extended its lead on all years except 2006.
The current difference between 2010 and the other years is as follows:
2006: -363K (59,609)
2007: -603K (63,328)
2008: -833K (56,474)
- 2009: -840K (55,938)
Between brackets is the average daily melt for June. 2010 currently has an average daily melt of 71,737 square km. Here's the graph:
The Arctic ROOS sea ice extent map has lost its interest ever since 2010 overtook all the other years there too, the Daily Arctic Oscillation Index is still slightly negative, the webcams are showing more puddling by the image, so here is something else, a video that Artful Dodger linked to in the last Animation blog post. It's a video of MODIS images of the melt season this far:
Check out noiv's other vids as well. Noiv wants critics to tell him what can be improved.
TIPS - Other interesting blog posts and news articles concerning Arctic ice:
Wayne Davidson has updated the news on his EH2R website, called 'Big Blue hits the world quite wide'. Quote:
The extent anomaly for Arctic sea ice is equal to the anomaly of 2008 at its summer end. Which is 2 months ahead of time in 2010, making 2010 the coming all time most melted Arctic Ocean ice ever.
ClimateProgress has a new Arctic-related post called When things were rotten: Arctic sees record sea ice shrinkage, headed toward record low volume.
There's an article on Before It's News called Worst Retreat of Arctic Sea Ice in Thousands of Years, announcing that a major international study of Arctic sea ice, involving 18 scientists from five countries and to be published in the journal Quaternary Science Reviews, has concluded that the recent, record-setting retreat is the worst in thousands of years.
AP has a story on our beloved alarmist symbol, the Polar bear. Sniff, I love Polar bears. And US senator Lisa Murkowski wants more heavy icebreakers to be more able to respond to Arctic emergencies. Somehow, I don't think she means bringing Polar bears to ice floes and back. Not unless the Polar bears know where the oil is.